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Paleoceanographic implications of Radiolaria in the southern Okinawa Trough over the last 20 000 years

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Abstract

Quantitative analyses have been carried out on radiolarians from 65 samples of Core 255 in the southern Okinawa Trough. The distribution of taxa and the results of Q-mode factor analysis show that during the last 20 000 years three radiolarian assemblages could be distinguished which can be correlated to high and low productivity levels indicated by the organic carbon content, radiolarian abundance and ratio of Nassellaria/Spumellaria in the sediment. TheTetrapyle quadriloba assemblage of thr last glaciation and deglaciation is associated with high productivity whereas the early HolocenePolysolenia spinosa and the middle and late HoloceneCarposhaera globosa assemblages correspond to low surface productivity. Meanwhile, the variations in the ratio of radiolarian fragments indicate higher SiO2 dissolution during the Holocene than during the last glacial stage.

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Authors and Affiliations

  1. Laboratory of Marine Geology of State Education Commission, Tongji University, 200092, Shanghai, China

    Wang Rujian & Jian Zhimin

  2. Chinese Academy of Sciences, Nanjing Institute of Geology and Paleontology, 210008, Nanjing, China

    Li Baohua

  3. State Oceanic Administration, Second Inistitute of Oceanography, 310012, Hangzhou, China

    Chen Ronghua

Authors
  1. Wang Rujian
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  2. Jian Zhimin
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  3. Li Baohua
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  4. Chen Ronghua
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Wang, R., Jian, Z., Li, B. et al. Paleoceanographic implications of Radiolaria in the southern Okinawa Trough over the last 20 000 years. Sci. China Ser. D-Earth Sci. 41, 21–27 (1998). https://doi.org/10.1007/BF02932416

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  • DOI: https://doi.org/10.1007/BF02932416

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